Security readout for executives and security teams
Plain-English summary
CVE-2026-24408 affects sigstore-python before 4.2.0. During OIDC authentication for signing, the tool generated a CSRF “state” value but did not appear to verify the returned value. The published CVSS impact is none, but affected signing workflows should still update because authentication flow integrity matters for software supply-chain trust.
Executive priority
Treat as a low-severity but supply-chain-relevant maintenance update. It does not have documented active exploitation or measured impact in the sources, but signing infrastructure should avoid known authentication-flow weaknesses. Schedule prompt dependency updates where sigstore-python is used for signing.
Technical view
The issue is CWE-352 in sigstore-python’s OAuth authentication flow. `_OAuthSession` creates a unique state parameter for the auth request, but prior to 4.2.0 the response state was apparently not cross-checked. The CVSS vector is AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:N with score 0.0.
Likely exposure
Exposure is limited to environments using sigstore-python versions earlier than 4.2.0, especially where interactive OIDC authentication is used during signing. Projects only verifying signatures, or not using sigstore-python, are not shown as affected by the provided sources.
Exploitation context
The sources describe a CSRF possibility requiring user interaction and high attack complexity. No provided source or KEV listing indicates active exploitation. The published CVSS vector lists no confidentiality, integrity, or availability impact, but the issue still concerns authentication flow correctness.
Researcher notes
The public record is concise. It identifies missing state validation in OAuth handling and points to the 4.2.0 patch commit and release. The CVSS score is 0.0 despite the CWE-352 classification, so researchers should review the patch and advisory before assigning operational risk.
Mitigation direction
- Upgrade sigstore-python to version 4.2.0 or later.
- Review vendor advisory GHSA-hm8f-75xx-w2vr for any updated guidance.
- Prioritize systems performing OIDC-backed signing with sigstore-python.
- Track dependency manifests for transitive or pinned sigstore-python versions.
Validation and detection
- Inventory installed sigstore-python versions in build, release, and developer environments.
- Confirm affected instances are below version 4.2.0.
- Verify upgraded environments report sigstore-python 4.2.0 or later.
- Review signing workflows that invoke OIDC authentication.
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-352: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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 lookupCVE-2026-24408 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
- None
- CVSS
- 0 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A: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:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:N1.60Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
0NoneVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/sigstore/sigstore-python/security/advisories/GHSA-hm8f-75xx-w2vrCVE reference · x_refsource_CONFIRM
- https://github.com/sigstore/sigstore-python/commit/5e77497fe8f0b202bdd118949074ec2f20da69aaCVE reference · x_refsource_MISC
- https://github.com/sigstore/sigstore-python/releases/tag/v4.2.0CVE 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.