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[GHSA-8ffj-4hx4-9pgf] [CVE-2026-39413] - Request for CVSS correction or clarification

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#7,373 1 comment 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
42/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Quiet
Domain
security

Research direction

Start with the CVE-2026-39413 advisory and compare its current CVSS vector with the attack details in the issue and the linked CVSS reference. Verify the claims about unauthenticated JWT forging and administrator impact; done means the advisory vector and justification are corrected, or the existing assessment is documented as accurate.

Written by the indexing model from the issue text.

Description

Hi GitHub,

Our automated CVSS enrichment pipeline detected some discrepancies between GitHub's provided vector and ours. Since this also passed a GitHub review, I thought it would be helpful to share my insights here, so that the vector or its justification might be corrected. For reference, this was the output from our AI pipeline: https://graph.volerion.com/view?id=CVE-2026-39413.

The current vector states AC:H, PR:H, UI:R, but an actual attack seems to involve only an unauthenticated attacker forging a valid JWT via a 'none' algorithm, therefore encountering none of those exploitation barriers.

Additionally, I would make the point that C:H/I:N/A:N is best changed to C:H/I:H/A:N to better reflect the potential administrator access an attacker might obtain after successful exploitation.

This comes down to a final vector of:
https://volerion.com/cvss/3.1#vector=CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
A pretty steep upgrade from a base score of 4.2 to 9.1.

I have hundreds more in the pipeline for 2026 alone, but unfortunately, I don't have the bandwidth to go through them all of them in this manner. Feel free to email me at karel@volerion.com and perhaps we can work out a more streamlined method of setting the records straight.

Thanks!

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