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CVE-2026-45667

Open WebUI: Unauthenticated endpoint can trigger embedding generation (cost/DoS)

6.5 MediumFix available

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.0, GET /api/v1/memories/ef is accessible without authentication and executes request.app.state.EMBEDDING_FUNCTION(...). This allows any unauthenticated caller to trigger embedding generation which can lead to direct cost exposure if a paid provider is used. This vulnerability is fixed in 0.8.0.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
Low

Exploit likelihood

0.34%Up 0.3 points since May 16, 2026
90%50%10%1%

What each source reports

CVE List Score used 6.5

Open WebUI: Unauthenticated endpoint can trigger embedding generation (cost/DoS)

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.0, GET /api/v1/memories/ef is accessible without authentication and executes request.app.state.EMBEDDING_FUNCTION(...). This allows any unauthenticated caller to trigger embedding generation which can lead to direct cost exposure if a paid provider is used. This vulnerability is fixed in 0.8.0.

Record
CVE-2026-45667
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Weakness
CWE-862
Updated
2026-11-02
EUVDEUVD-2026-30665 6.5

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.0, GET /api/v1/memories/ef is accessible without authentication and executes request.app.state.EMBEDDING_FUNCTION(...). This allows any unauthenticated caller to trigger embedding generation which can lead to direct cost exposure if a paid provider is used. This vulnerability is fixed in 0.8.0.

Record
EUVD-2026-30665
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Updated
2026-11-02
GitHub AdvisoriesGHSA-m69w-p7m4-585j 6.5

Open WebUI: Unauthenticated endpoint can trigger embedding generation (cost/DoS)

Summary

GET /api/v1/memories/ef is accessible without authentication and executes request.app.state.EMBEDDING_FUNCTION(...). This allows any unauthenticated caller to trigger embedding generation which can lead to direct cost exposure if a paid provider is used. Code reference: backend/open_webui/routers/memories.py (@router.get("/ef") -> calls request.app.state.EMBEDDING_FUNCTION("hello world")).

Details

GET /api/v1/memories/ef is reachable without authentication and triggers request.app.state.EMBEDDING_FUNCTION("hello world"). This crosses an intended security boundary by allowing unauthenticated users to invoke potentially expensive embedding computation and/or paid upstream embedding APIs.

PoC

  1. Start Open WebUI in default configuration (no special env hardening; default ENABLE_MEMORIES is true).
  2. From an unauthenticated client (no cookies/Authorization header), call: curl -i http://<host>:<port>/api/v1/memories/ef 3. Observe the server performs embedding generation and returns a response like:
    • HTTP 200 with JSON containing the result.

How it can be abused / attacker actions:

  • Send repeated requests to /api/v1/memories/ef to:
    • consume CPU/GPU resources (DoS)
    • generate sustained outbound usage to embedding providers if configured (cost + rate-limit exhaustion)
    • degrade latency/availability for legitimate users

Impact

If embeddings are configured to use paid/remote providers (OpenAI/Azure/etc), an attacker can generate unlimited requests and incur charges.

Resolution

Fixed in commit e5035ea31, first released in v0.8.0 (Feb 2026). The /api/v1/memories/ef route was removed entirely. It was a diagnostic/debug-style endpoint that hard-coded "hello world" through the embedding function without any authentication dependency; there was no legitimate caller that depended on it, so deletion was the cleaner fix than retrofitting auth. Users on >= 0.8.0 are not affected.

Record
GHSA-m69w-p7m4-585j
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Weakness
CWE-862
Updated
2026-11-02
NVD 6.5

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.0, GET /api/v1/memories/ef is accessible without authentication and executes request.app.state.EMBEDDING_FUNCTION(...). This allows any unauthenticated caller to trigger embedding generation which can lead to direct cost exposure if a paid provider is used. This vulnerability is fixed in 0.8.0.

Record
CVE-2026-45667
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Weakness
CWE-862
Updated
2026-11-02
OSV 6.5

Open WebUI: Unauthenticated endpoint can trigger embedding generation (cost/DoS)

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.0, GET /api/v1/memories/ef is accessible without authentication and executes request.app.state.EMBEDDING_FUNCTION(...). This allows any unauthenticated caller to trigger embedding generation which can lead to direct cost exposure if a paid provider is used. This vulnerability is fixed in 0.8.0.

Record
CVE-2026-45667
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Weakness
CWE-862
Updated
2026-11-02
OSVGHSA-m69w-p7m4-585j 6.5

Open WebUI: Unauthenticated endpoint can trigger embedding generation (cost/DoS)

Summary

GET /api/v1/memories/ef is accessible without authentication and executes request.app.state.EMBEDDING_FUNCTION(...). This allows any unauthenticated caller to trigger embedding generation which can lead to direct cost exposure if a paid provider is used. Code reference: backend/open_webui/routers/memories.py (@router.get("/ef") -> calls request.app.state.EMBEDDING_FUNCTION("hello world")).

Details

GET /api/v1/memories/ef is reachable without authentication and triggers request.app.state.EMBEDDING_FUNCTION("hello world"). This crosses an intended security boundary by allowing unauthenticated users to invoke potentially expensive embedding computation and/or paid upstream embedding APIs.

PoC

  1. Start Open WebUI in default configuration (no special env hardening; default ENABLE_MEMORIES is true).
  2. From an unauthenticated client (no cookies/Authorization header), call: curl -i http://<host>:<port>/api/v1/memories/ef 3. Observe the server performs embedding generation and returns a response like:
    • HTTP 200 with JSON containing the result.

How it can be abused / attacker actions:

  • Send repeated requests to /api/v1/memories/ef to:
    • consume CPU/GPU resources (DoS)
    • generate sustained outbound usage to embedding providers if configured (cost + rate-limit exhaustion)
    • degrade latency/availability for legitimate users

Impact

If embeddings are configured to use paid/remote providers (OpenAI/Azure/etc), an attacker can generate unlimited requests and incur charges.

Resolution

Fixed in commit e5035ea31, first released in v0.8.0 (Feb 2026). The /api/v1/memories/ef route was removed entirely. It was a diagnostic/debug-style endpoint that hard-coded "hello world" through the embedding function without any authentication dependency; there was no legitimate caller that depended on it, so deletion was the cleaner fix than retrofitting auth. Users on >= 0.8.0 are not affected.

Record
GHSA-m69w-p7m4-585j
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Weakness
CWE-862
Updated
2026-11-02
OSVPYSEC-2026-2747 6.5

Open WebUI: Unauthenticated endpoint can trigger embedding generation (cost/DoS)

Summary

GET /api/v1/memories/ef is accessible without authentication and executes request.app.state.EMBEDDING_FUNCTION(...). This allows any unauthenticated caller to trigger embedding generation which can lead to direct cost exposure if a paid provider is used. Code reference: backend/open_webui/routers/memories.py (@router.get("/ef") -> calls request.app.state.EMBEDDING_FUNCTION("hello world")).

Details

GET /api/v1/memories/ef is reachable without authentication and triggers request.app.state.EMBEDDING_FUNCTION("hello world"). This crosses an intended security boundary by allowing unauthenticated users to invoke potentially expensive embedding computation and/or paid upstream embedding APIs.

PoC

  1. Start Open WebUI in default configuration (no special env hardening; default ENABLE_MEMORIES is true).
  2. From an unauthenticated client (no cookies/Authorization header), call: curl -i http://<host>:<port>/api/v1/memories/ef 3. Observe the server performs embedding generation and returns a response like:
    • HTTP 200 with JSON containing the result.

How it can be abused / attacker actions:

  • Send repeated requests to /api/v1/memories/ef to:
    • consume CPU/GPU resources (DoS)
    • generate sustained outbound usage to embedding providers if configured (cost + rate-limit exhaustion)
    • degrade latency/availability for legitimate users

Impact

If embeddings are configured to use paid/remote providers (OpenAI/Azure/etc), an attacker can generate unlimited requests and incur charges.

Resolution

Fixed in commit e5035ea31, first released in v0.8.0 (Feb 2026). The /api/v1/memories/ef route was removed entirely. It was a diagnostic/debug-style endpoint that hard-coded "hello world" through the embedding function without any authentication dependency; there was no legitimate caller that depended on it, so deletion was the cleaner fix than retrofitting auth. Users on >= 0.8.0 are not affected.

Record
PYSEC-2026-2747
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
open-webui
PyPI
 through 0.7.2
0.8.0
open-webui
PyPI
 before 0.8.0, plus listed versions
0.1.1240.1.1250.2.00.2.10.2.2
Show 45 moreShow less
0.2.30.2.40.2.50.3.00.3.10.3.100.3.120.3.130.3.140.3.150.3.160.3.170.3.17.dev20.3.17.dev30.3.17.dev40.3.17.dev50.3.180.3.190.3.20.3.200.3.210.3.220.3.230.3.240.3.250.3.260.3.270.3.27.dev10.3.27.dev20.3.27.dev30.3.280.3.290.3.30.3.300.3.30.dev10.3.30.dev20.3.310.3.31.dev10.3.320.3.330.3.33.dev10.3.340.3.350.3.40.3.5
0.8.0

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-45667 is a medium vulnerability (CVSS 6.5) in Openwebui Open Webui, published May 14, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.34%, the 27th percentile. Fixed in open-webui 0.8.0.

References

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Left out here: 88 versions. The JSON record has them.

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