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01 Record

CVE-2026-91121

Discourse: Chat upload filenames rendered as raw HTML in excerpts

MediumPUBLISHEDCNA: GitHub_M
CNA base score5.0 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
View raw JSON

02 Description

Discourse: Chat upload filenames rendered as raw HTML in excerpts

03 Exploitation and scoring

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
0.25% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 17.3% of scored records. A rank, not a probability.
NVD base score
5.0 (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:L/A:N
NVD analysis status
Deferred. NVD last modified this record on 2026-09-24.
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.

04 Metadata

Published
2026-09-24 17:05Z1 MO AGO
Last updated
2026-09-24 17:27Z1 MO AGO
Reserved
2026-09-14
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
Medium (CVSS 5.0)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
Weaknesses
  • CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Base
Data version
5.2
Document digest
ebe1a3bc5cc3cec0c65728992a653e2551599fce317b7f536c6b1a59088bd5a0

05 Affected products

VendorProductVersionsPlatforms
discoursediscourse< 2026.8.0, >= 2026.7.0-latest, < 2026.7.2, >= 2026.6.0-latest, < 2026.6.3, >= 2026.1.0-latest, < 2026.1.8—

06 References