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01 Record

CVE-2026-55424

Discourse: Topic featured link susceptible to stored XSS

HighPUBLISHEDCNA: GitHub_M
CNA base score7.4 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
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02 Description

Discourse: Topic featured link susceptible to stored XSS

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 ImpacttotalSuccessful exploitation gives total 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 35.4% of scored records. A rank, not a probability.
NVD base score
7.4 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD analysis status
Analyzed. NVD last modified this record on 2026-07-14.
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
2026-07-09 22:01Z3 MO AGO
Last updated
2026-07-10 14:40Z3 MO AGO
Reserved
2026-06-16
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
High (CVSS 7.4)
CNA CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Weaknesses
  • CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Base
Data version
5.2
Document digest
385dc9f2da3c81c0e42a92e8439c0d69b224614995c66c400fcd0d00e83d09ef

05 Affected products

VendorProductVersionsPlatforms
discoursediscourse>= 2026.1.0-latest, < 2026.1.5, >= 2026.4.0-latest, < 2026.4.2, >= 2026.5.0-latest, < 2026.5.1—

06 References