CVE-2026-27166

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

0.19% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 8.9% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

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

2026-03-19 20:29Z7 MO AGO

Last updated

2026-03-21 03:31Z7 MO AGO

Reserved

2026-02-18

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Medium (CVSS 4.1)

CNA CVSS vector

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

Weaknesses

• CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)Variant

Data version

5.2

Document digest

cc2d4f48fe50169b45832bbea2b23c6dbe9eaf300bafc4eb199143401c1ef908

• github.comhttps://github.com/discourse/discourse/security/advisories/GHSA-h653-cq78-vjj2x_refsource_CONFIRM
• github.comhttps://github.com/discourse/discourse/commit/c4762a4fac2f61f52f325396b11d3aeb955ea925x_refsource_MISC