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01 Record

CVE-2026-63466

Unleash: Global Mustache.escape override disables HTML escaping process-wide, enabling Slack/Teams link-injection via unrestricted username

MediumPUBLISHEDCNA: GitHub_M
CNA base score4.1 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N

02 Description

Unleash: Global Mustache.escape override disables HTML escaping process-wide, enabling Slack/Teams link-injection via unrestricted username

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
0.31% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 24.6% of scored records. A rank, not a probability.
NVD base score
4.1 (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:N/I:L/A:N
NVD analysis status
Deferred. NVD last modified this record on 2026-10-14.
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
2026-08-21 18:21Z2 MO AGO
Last updated
2026-08-21 21:43Z2 MO AGO
Reserved
2026-07-16
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-116Improper Encoding or Escaping of OutputClass
Data version
5.2
Document digest
60a84e14fb61f54e4818677fd43093cd6c108f4fcf8697b8bad31e71dc7dc5b6

05 Affected products

VendorProductVersionsPlatforms
Unleashunleash< 8.0.3—

06 References