CVE-2023-34036
Forwarded header exploit with Spring HATEOAS on WebFlux
Reactive web applications that use Spring HATEOAS to produce hypermedia-based responses might be exposed to malicious forwarded headers if they are not behind a trusted proxy that ensures correctness of such headers, or if they don't have anything else in place to handle (and possibly discard) forwarded headers either in WebFlux or at the level of the underlying HTTP server.
For the application to be affected, it needs to satisfy the following requirements:
- It needs to use the reactive web stack (Spring WebFlux) and Spring HATEOAS to create links in hypermedia-based responses.
- The application infrastructure does not guard against clients submitting (X-)Forwarded… headers.
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
- None
Exploit likelihood
What each source reports
CVE List Score used
Forwarded header exploit with Spring HATEOAS on WebFlux
Reactive web applications that use Spring HATEOAS to produce hypermedia-based responses might be exposed to malicious forwarded headers if they are not behind a trusted proxy that ensures correctness of such headers, or if they don't have anything else in place to handle (and possibly discard) forwarded headers either in WebFlux or at the level of the underlying HTTP server.
For the application to be affected, it needs to satisfy the following requirements:
- It needs to use the reactive web stack (Spring WebFlux) and Spring HATEOAS to create links in hypermedia-based responses.
- The application infrastructure does not guard against clients submitting (X-)Forwarded… headers.
- Record
CVE-2023-34036- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-644
- Updated
- 2026-11-02
EUVDEUVD-2023-1992
Reactive web applications that use Spring HATEOAS to produce hypermedia-based responses might be exposed to malicious forwarded headers if they are not behind a trusted proxy that ensures correctness of such headers, or if they don't have anything else in place to handle (and possibly discard) forwarded headers either in WebFlux or at the level of the underlying HTTP server.
For the application to be affected, it needs to satisfy the following requirements:
- It needs to use the reactive web stack (Spring WebFlux) and Spring HATEOAS to create links in hypermedia-based responses.
- The application infrastructure does not guard against clients submitting (X-)Forwarded… headers.
- Record
EUVD-2023-1992- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-7m5c-fgwf-mwph
Spring HATEOAS vulnerable to Improper Neutralization of HTTP Headers for Scripting Syntax
Reactive web applications that use Spring HATEOAS to produce hypermedia-based responses might be exposed to malicious forwarded headers if they are not behind a trusted proxy that ensures correctness of such headers, or if they don't have anything else in place to handle (and possibly discard) forwarded headers either in WebFlux or at the level of the underlying HTTP server.
For the application to be affected, it needs to satisfy the following requirements:
- It needs to use the reactive web stack (Spring WebFlux) and Spring HATEOAS to create links in hypermedia-based responses.
- The application infrastructure does not guard against clients submitting (X-)Forwarded… headers.
- Record
GHSA-7m5c-fgwf-mwph- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-116, CWE-644
- Updated
- 2026-11-02
NVD
Reactive web applications that use Spring HATEOAS to produce hypermedia-based responses might be exposed to malicious forwarded headers if they are not behind a trusted proxy that ensures correctness of such headers, or if they don't have anything else in place to handle (and possibly discard) forwarded headers either in WebFlux or at the level of the underlying HTTP server.
For the application to be affected, it needs to satisfy the following requirements:
- It needs to use the reactive web stack (Spring WebFlux) and Spring HATEOAS to create links in hypermedia-based responses.
- The application infrastructure does not guard against clients submitting (X-)Forwarded… headers.
- Record
CVE-2023-34036- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-644, CWE-116
- Updated
- 2026-11-02
OSV
Forwarded header exploit with Spring HATEOAS on WebFlux
Reactive web applications that use Spring HATEOAS to produce hypermedia-based responses might be exposed to malicious forwarded headers if they are not behind a trusted proxy that ensures correctness of such headers, or if they don't have anything else in place to handle (and possibly discard) forwarded headers either in WebFlux or at the level of the underlying HTTP server.
For the application to be affected, it needs to satisfy the following requirements:
- It needs to use the reactive web stack (Spring WebFlux) and Spring HATEOAS to create links in hypermedia-based responses.
- The application infrastructure does not guard against clients submitting (X-)Forwarded… headers.
- Record
CVE-2023-34036- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-644
- Updated
- 2026-11-02
OSVGHSA-7m5c-fgwf-mwph
Spring HATEOAS vulnerable to Improper Neutralization of HTTP Headers for Scripting Syntax
Reactive web applications that use Spring HATEOAS to produce hypermedia-based responses might be exposed to malicious forwarded headers if they are not behind a trusted proxy that ensures correctness of such headers, or if they don't have anything else in place to handle (and possibly discard) forwarded headers either in WebFlux or at the level of the underlying HTTP server.
For the application to be affected, it needs to satisfy the following requirements:
- It needs to use the reactive web stack (Spring WebFlux) and Spring HATEOAS to create links in hypermedia-based responses.
- The application infrastructure does not guard against clients submitting (X-)Forwarded… headers.
- Record
GHSA-7m5c-fgwf-mwph- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-116, CWE-644
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
org.springframework.hateoas:spring-hateoasMaven |
before 1.5.5 | 1.5.5 |
org.springframework.hateoas:spring-hateoasMaven |
2.0.0 up to 2.0.5 | 2.0.5 |
org.springframework.hateoas:spring-hateoasMaven |
2.1.0 up to 2.1.1 | 2.1.1 |
org.springframework.hateoas:spring-hateoasMaven |
before 1.5.5, plus listed versions 0.0.0.1.1.4.TEST-RELEASE0.0.0.1.2.3-SNAPSHOT.10.0.0.1.3.0-HATEOAS-1417-SNAPSHOT.10.1.0.RELEASE0.10.0.RELEASE Show 45 moreShow less0.11.0.RELEASE0.12.0.RELEASE0.13.0.RELEASE0.14.0.RELEASE0.15.0.RELEASE0.16.0.RELEASE0.17.0.RELEASE0.18.0.RELEASE0.19.0.RELEASE0.2.0.RELEASE0.20.0.RELEASE0.21.0.RELEASE0.22.0.RELEASE0.23.0.RELEASE0.24.0.RELEASE0.25.0.RELEASE0.25.1.RELEASE0.25.2.RELEASE0.3.0.RELEASE0.4.0.RELEASE0.5.0.RELEASE0.6.0.RELEASE0.7.0.RELEASE0.8.0.RELEASE0.9.0.RELEASE1.0.0.RELEASE1.0.1.RELEASE1.0.2.RELEASE1.0.3.RELEASE1.0.4.RELEASE1.0.5.RELEASE1.1.0.RELEASE1.1.1.RELEASE1.1.2.RELEASE1.1.3.RELEASE1.1.4.RELEASE1.1.5.RELEASE1.2.01.2.11.2.101.2.111.2.21.2.31.2.41.2.5 |
1.5.5 |
org.springframework.hateoas:spring-hateoasMaven |
2.0.0 up to 2.0.5, plus listed versions 2.0.12.0.22.0.32.0.4 |
2.0.5 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2023-34036 is a medium vulnerability (CVSS 5.3) in Spring Hateoas, published July 17, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.47%, the 41st percentile. Fixed in org.springframework.hateoas:spring-hateoas 1.5.5.
References
Left out here: 23 versions. The JSON record has them.