CVE-2026-53963

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

0.73% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 51.7% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

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.

Published

2026-07-09 22:05Z1 MO AGO

Last updated

2026-07-14 01:19Z1 MO AGO

Reserved

2026-06-11

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 7.3)

CNA CVSS vector

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

Weaknesses

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

Data version

5.2

Document digest

76f5fa017aea15c8e7f7d56e109afb8d2bec0d88989f72711a08f94fa6236f03

• github.comhttps://github.com/discourse/discourse/security/advisories/GHSA-wg5x-7f23-m3r5x_refsource_CONFIRM
• github.comhttps://github.com/discourse/discourse/commit/40de62cddadc65c328a1028ab999f3fa94adbfedx_refsource_MISC
• github.comhttps://github.com/discourse/discourse/commit/529e17d4d570a48972e7cf64720e5dd1fdf23ca8x_refsource_MISC
• github.comhttps://github.com/discourse/discourse/commit/d92973e51a46cf6dd20c71e6068e6769b67eea5bx_refsource_MISC
• github.comhttps://github.com/discourse/discourse/commit/daea5214d833eacbdd3b1a78d99eb14e9cabd915x_refsource_MISC
• github.comhttps://github.com/discourse/discourse/releases/tag/v2026.1.5x_refsource_MISC
• github.comhttps://github.com/discourse/discourse/releases/tag/v2026.4.2x_refsource_MISC
• github.comhttps://github.com/discourse/discourse/releases/tag/v2026.5.1x_refsource_MISC
• github.comhttps://github.com/discourse/discourse/releases/tag/v2026.6.0x_refsource_MISC