CVE-2023-5256
Drupal core - Critical - Cache poisoning - SA-CORE-2023-006
In certain scenarios, Drupal's JSON:API module will output error backtraces. With some configurations, this may cause sensitive information to be cached and made available to anonymous users, leading to privilege escalation.
This vulnerability only affects sites with the JSON:API module enabled, and can be mitigated by uninstalling JSON:API.
The core REST and contributed GraphQL modules are not affected.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
In certain scenarios, Drupal's JSON:API module will output error backtraces. With some configurations, this may cause sensitive information to be cached and made available to anonymous users, leading to privilege escalation.
This vulnerability only affects sites with the JSON:API module enabled, and can be mitigated by uninstalling JSON:API.
The core REST and contributed GraphQL modules are not affected.
- Record
CVE-2023-5256- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-200
- Updated
- 2026-11-02
CVE List
Drupal core - Critical - Cache poisoning - SA-CORE-2023-006
In certain scenarios, Drupal's JSON:API module will output error backtraces. With some configurations, this may cause sensitive information to be cached and made available to anonymous users, leading to privilege escalation.
This vulnerability only affects sites with the JSON:API module enabled, and can be mitigated by uninstalling JSON:API.
The core REST and contributed GraphQL modules are not affected.
- Record
CVE-2023-5256- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-200
- Updated
- 2026-11-02
EUVDEUVD-2023-2586
In certain scenarios, Drupal's JSON:API module will output error backtraces. With some configurations, this may cause sensitive information to be cached and made available to anonymous users, leading to privilege escalation.
This vulnerability only affects sites with the JSON:API module enabled, and can be mitigated by uninstalling JSON:API.
The core REST and contributed GraphQL modules are not affected.
- Record
EUVD-2023-2586- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-6ccv-8fgf-cjpw No score
Drupal core Denial of Service vulnerability
The Comment module allows users to reply to comments. In certain cases, an attacker could make comment reply requests that would trigger a denial of service (DOS).
Sites that do not use the Comment module are not affected.
- Record
GHSA-6ccv-8fgf-cjpw- Updated
- 2026-11-02
GitHub AdvisoriesGHSA-rjqg-3h9m-fx5x No score
Cache poisoning in drupal/core
In certain scenarios, Drupal's JSON:API module will output error backtraces. With some configurations, this may cause sensitive information to be cached and made available to anonymous users, leading to privilege escalation.
This vulnerability only affects sites with the JSON:API module enabled, and can be mitigated by uninstalling JSON:API.
The core REST and contributed GraphQL modules are not affected.
- Record
GHSA-rjqg-3h9m-fx5x- Weakness
- CWE-200
- Updated
- 2026-11-02
OSV
Drupal core - Critical - Cache poisoning - SA-CORE-2023-006
In certain scenarios, Drupal's JSON:API module will output error backtraces. With some configurations, this may cause sensitive information to be cached and made available to anonymous users, leading to privilege escalation.
This vulnerability only affects sites with the JSON:API module enabled, and can be mitigated by uninstalling JSON:API.
The core REST and contributed GraphQL modules are not affected.
- Record
CVE-2023-5256- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-200
- Updated
- 2026-11-02
Show 6 moreShow less
OSVUBUNTU-CVE-2023-5256
In certain scenarios, Drupal's JSON:API module will output error backtraces. With some configurations, this may cause sensitive information to be cached and made available to anonymous users, leading to privilege escalation. This vulnerability only affects sites with the JSON:API module enabled, and can be mitigated by uninstalling JSON:API. The core REST and contributed GraphQL modules are not affected.
- Record
UBUNTU-CVE-2023-5256- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVBIT-drupal-2023-5256 No score
Drupal core - Critical - Cache poisoning - SA-CORE-2023-006
In certain scenarios, Drupal's JSON:API module will output error backtraces. With some configurations, this may cause sensitive information to be cached and made available to anonymous users, leading to privilege escalation.
This vulnerability only affects sites with the JSON:API module enabled, and can be mitigated by uninstalling JSON:API.
The core REST and contributed GraphQL modules are not affected.
- Record
BIT-drupal-2023-5256- Updated
- 2026-11-02
OSVCLSA-2026-1784682869 No score
TuxCare security update for drupal/core (21 CVEs)
TuxCare rebuilt drupal/core to address 21 CVEs. Fixed in 8.9.20-p1+tuxcare.
- Record
CLSA-2026-1784682869- Updated
- 2026-11-02
OSVDRUPAL-CORE-2023-006 No score
In certain scenarios, Drupal's JSON:API module will output error backtraces. With some configurations, this may cause sensitive information to be cached and made available to anonymous users, leading to privilege escalation.
This vulnerability only affects sites with the JSON:API module enabled, and can be mitigated by uninstalling JSON:API.
The core REST and contributed GraphQL modules are not affected.
Drupal Steward partners have been made aware of this issue. Some platforms may provide mitigations. However, not all WAF configurations can mitigate the issue, so it is still recommended to update promptly to this security release if your site uses JSON:API.
- Record
DRUPAL-CORE-2023-006- Updated
- 2026-11-02
OSVGHSA-6ccv-8fgf-cjpw No score
Drupal core Denial of Service vulnerability
The Comment module allows users to reply to comments. In certain cases, an attacker could make comment reply requests that would trigger a denial of service (DOS).
Sites that do not use the Comment module are not affected.
- Record
GHSA-6ccv-8fgf-cjpw- Updated
- 2026-11-02
OSVGHSA-rjqg-3h9m-fx5x No score
Cache poisoning in drupal/core
In certain scenarios, Drupal's JSON:API module will output error backtraces. With some configurations, this may cause sensitive information to be cached and made available to anonymous users, leading to privilege escalation.
This vulnerability only affects sites with the JSON:API module enabled, and can be mitigated by uninstalling JSON:API.
The core REST and contributed GraphQL modules are not affected.
- Record
GHSA-rjqg-3h9m-fx5x- Weakness
- CWE-200
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
drupal/corePackagist |
8.0.0 up to 10.1.8 | 10.1.8 |
drupal/corePackagist |
10.2.0 up to 10.2.2 | 10.2.2 |
drupal/corePackagist |
8.7.0 up to 9.5.11 | 9.5.11 |
drupal/corePackagist |
10.0.0 up to 10.0.11 | 10.0.11 |
drupal/corePackagist |
10.1.0 up to 10.1.4 | 10.1.4 |
drupalBitnami |
8.7.0 up to 9.5.11, 10.0.0 up to 10.0.11, 10.1.0 up to 10.1.4 | 9.5.1110.0.1110.1.4 |
drupal/coreTuxCare:Packagist From an advisory covering 20 CVEs |
8.9.20 up to 8.9.20-p1+tuxcare | 8.9.20-p1+tuxcare |
drupal/corePackagist |
8.7.0 up to 9.5.11, 10.0.0 up to 10.0.11, 10.1.0 up to 10.1.4, plus listed versions 10.0.110.0.1010.0.210.0.310.0.4 Show 45 moreShow less10.0.510.0.610.0.710.0.810.0.910.1.110.1.210.1.38.7.18.7.108.7.118.7.128.7.138.7.148.7.28.7.38.7.48.7.58.7.68.7.78.7.88.7.98.8.08.8.0-alpha18.8.0-beta18.8.0-rc18.8.18.8.108.8.118.8.128.8.28.8.38.8.48.8.58.8.68.8.78.8.88.8.98.9.08.9.0-beta18.9.0-beta28.9.0-beta38.9.0-rc18.9.18.9.10 |
9.5.1110.0.1110.1.4 |
drupal/corePackagist |
8.0.0 up to 10.1.8, plus listed versions 10.0.010.0.0-alpha110.0.0-alpha210.0.0-alpha310.0.0-alpha4 Show 45 moreShow less10.0.0-alpha510.0.0-alpha610.0.0-alpha710.0.0-beta110.0.0-beta210.0.0-rc110.0.0-rc210.0.0-rc310.0.110.0.1010.0.1110.0.210.0.310.0.410.0.510.0.610.0.710.0.810.0.910.1.010.1.0-alpha110.1.0-beta110.1.0-rc110.1.110.1.210.1.310.1.410.1.510.1.610.1.78.0.18.0.28.0.38.0.48.0.58.0.68.1.08.1.0-beta18.1.0-beta28.1.0-rc18.1.18.1.108.1.28.1.38.1.4 |
10.1.8 |
drupal/corePackagist |
10.2.0 up to 10.2.2, plus listed versions 10.2.1 |
10.2.2 |
Show 5 moreShow less
| Package | Affected | Fixed |
|---|---|---|
drupal/corePackagist |
8.7.0 up to 9.5.11, plus listed versions 8.7.18.7.108.7.118.7.128.7.13 Show 45 moreShow less8.7.148.7.28.7.38.7.48.7.58.7.68.7.78.7.88.7.98.8.08.8.0-alpha18.8.0-beta18.8.0-rc18.8.18.8.108.8.118.8.128.8.28.8.38.8.48.8.58.8.68.8.78.8.88.8.98.9.08.9.0-beta18.9.0-beta28.9.0-beta38.9.0-rc18.9.18.9.108.9.118.9.128.9.138.9.148.9.158.9.168.9.178.9.188.9.198.9.28.9.208.9.38.9.4 |
9.5.11 |
drupal/corePackagist |
10.0.0 up to 10.0.11, plus listed versions 10.0.110.0.1010.0.210.0.310.0.4 Show 5 moreShow less10.0.510.0.610.0.710.0.810.0.9 |
10.0.11 |
drupal/corePackagist |
10.1.0 up to 10.1.4, plus listed versions 10.1.110.1.210.1.3 |
10.1.4 |
drupal7Ubuntu:Pro:14.04:LTS |
All versions, plus listed versions 7.23-17.24-17.24-27.26-17.26-1ubuntu0.17.26-1ubuntu0.1+esm17.26-1ubuntu0.1+esm27.26-1ubuntu0.1+esm3 |
None known |
drupal7Ubuntu:Pro:16.04:LTS |
All versions, plus listed versions 7.38-17.41-17.44-1ubuntu1~16.04.07.44-1ubuntu1~16.04.0+esm17.44-1ubuntu1~16.04.0+esm27.44-1ubuntu1~16.04.0+esm3 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| aliases, products | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2023-5256 is a high vulnerability (CVSS 7.5) in Drupal Core, published September 20, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.85%, the 58th percentile. Fixed in drupal/core 10.1.8.
References
drupal.org/sa-core-2023-006
github.com/drupal/core/commit/2f76ac716ca8019bc60579fdfc8aa6cd65d57dff
Show 9 moreShow less
nvd.nist.gov/vuln/detail/CVE-2023-5256
ubuntu.com/security/CVE-2023-5256
cve.org/CVERecord?id=CVE-2023-5256
Left out here: 569 versions. The JSON record has them.