CVE-2026-91159

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.41% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 35.7% of scored records. A rank, not a probability.

NVD base score

7.7 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

NVD analysis status

Deferred. NVD last modified this record on 2026-10-20.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-10-14 15:30Z14 DAYS AGO

Last updated

2026-10-20 01:33Z9 DAYS AGO

Reserved

2026-09-14

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 7.7)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

Weaknesses

• CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Base

Data version

5.2

Document digest

c890d04b53e1cc03d6354cb726f323e3673381d545bc7072620fb45aa00a8f45

• github.comhttps://github.com/discourse/discourse/security/advisories/GHSA-f9jx-vv33-4282x_refsource_CONFIRM
• github.comhttps://github.com/discourse/discourse/commit/0953b31f5c2949d7d6ab5f6dc4c5e2f1b8bf0b22x_refsource_MISC
• github.comhttps://github.com/discourse/discourse/commit/3fc2bad6cdca47b00958330d1ee612aa141b039ax_refsource_MISC
• github.comhttps://github.com/discourse/discourse/commit/dde8bc4fb6200139f5eff7e100b0f3e829d37ab3x_refsource_MISC
• github.comhttps://github.com/discourse/discourse/commit/ed6f83f123d1a4c6c6c7e64c8a2233e3cb6a28d7x_refsource_MISC