Security readout for executives and security teams
Plain-English summary
ZITADEL Actions can be configured to call localhost or internal IP addresses, creating a limited server-side request forgery risk. An attacker with high privileges could use this to learn about internal services. The vendor rates this low severity, and no active exploitation is cited in the provided sources.
Executive priority
Treat as a controlled, low-severity remediation item unless ZITADEL Actions are widely delegated or deployed in sensitive networks. Prioritize upgrade or egress controls during the next maintenance window, and verify no Actions target internal services unexpectedly.
Technical view
CVE-2026-27945 affects ZITADEL Action V2 in versions >=2.59.0 and <4.11.1. Action target URLs may reach local hosts or internal services. Required privileges are high, responses must match expected schemas, and impact is limited to low confidentiality and integrity effects. Version 4.11.1 adds URL denylist checks blocking localhost and loopback by default.
Likely exposure
Exposure is most relevant for self-hosted ZITADEL deployments using Action V2 with administrators or developers able to configure action target URLs. Versions 2.59.0 through 3.x are affected, but the feature was preview or beta there. ZITADEL 4.x before 4.11.1 is also affected.
Exploitation context
The sources describe potential SSRF but do not cite public exploitation or KEV listing. Abuse requires high privileges and valid Action configuration access. The response schema requirement reduces usefulness, but internal network probing or interaction with unintended endpoints may still be possible.
Researcher notes
The advisory states no backport was feasible for v2.x and v3.x because the feature was preview or beta and later changed. The provided release references include v3.4.7 and v4.11.0, while the described fix is 4.11.1; validate exact fixed release through the GitHub advisory before closure.
Mitigation direction
- Upgrade ZITADEL 4.x deployments to version 4.11.1 or later when available.
- If unable to upgrade, restrict Action egress with network policies or firewall rules.
- Review vendor advisory guidance for v2.x and v3.x deployments.
- Limit who can configure ZITADEL Actions and audit recent Action target URL changes.
Validation and detection
- Inventory ZITADEL versions and identify deployments between 2.59.0 and 4.11.1.
- Determine whether Action V2 is enabled or used in each deployment.
- Review configured Action target URLs for localhost, loopback, or internal-only destinations.
- Confirm egress controls block unintended internal endpoints from the ZITADEL runtime.
- Verify upgraded 4.x instances enforce the vendor denylist behavior.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-918: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCloud metadata behavior lookup
The CVE wording references SSRF or metadata access, so cloud discovery and credential material review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-27945 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Low
- CVSS
- 2.1 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
2.1LowVector: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/zitadel/zitadel/security/advisories/GHSA-7777-fhq9-592vCVE reference · x_refsource_CONFIRM
- https://github.com/zitadel/zitadel/releases/tag/v3.4.7CVE reference · x_refsource_MISC
- https://github.com/zitadel/zitadel/releases/tag/v4.11.0CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Server-Side Request Forgery (SSRF)
Server-Side Request Forgery (SSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.