CVE-2026-55671 json
ZITADEL: Server-Side Request Forgery (SSRF) and Denylist Bypass in Outgoing HTTP Components
published 2026-06-18 4 mo ago modified 2026-07-14 3 mo ago also GHSA-29jh-8cfq-rr8x , GO-2026-5059 , EUVD-2026-42978
- cvss
- 2.3
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 35%
- public exploits
- 0
- none known
Summary
ZITADEL is an open source identity management platform. From 4.0.0-rc.1 through 4.15.1, ZITADEL's HTTP notification channels, OIDC BackChannel Logout, and SAML metadata URL fetches do not consistently validate user-defined URLs against protected denylist handling, allowing server-side requests to loopback, internal IP, link-local, or redirected endpoints through DNS rebinding, redirects, or protocol downgrades. This issue is fixed in version 4.15.2.
Patch / fix
- go github.com/zitadel/zitadel 1.80.0-v2.20.0.20260615133614-8e82ec1cb9a2
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 3 mo ago
Exploit prediction
0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 2.3 | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N |
| CNA | 4.0 | 2.3 | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/zitadel/zitadel | <1.80.0-v2.20.0.20260615133614-8e82ec1cb9a2 |
1.80.0-v2.20.0.20260615133614-8e82ec1cb9a2 |
Affected products
- zitadel zitadel
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
- github.com /zitadel/zitadel/commit/b6f78086913b8d916bce9ab2e049ab0d84f947fd
-
github.com
/zitadel/zitadel/commit/8e82ec1cb9a2b154ff48d3a0fa96b43d1428061f
web, patch
-
github.com
/zitadel/zitadel/security/advisories/GHSA-29jh-8cfq-rr8x
web, advisory
-
github.com
/zitadel/zitadel/releases/tag/v4.15.2
web
-
github.com
/zitadel/zitadel
package
Sources
- CVE List CVE-2026-55671
- GitHub Advisory GHSA-29jh-8cfq-rr8x
- NVD CVE-2026-55671
- OSV GO-2026-5059
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.