CVE-2026-53727

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• 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

0.50% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 42.9% of scored records. A rank, not a probability.

NVD base score

8.9 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/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 2026-10-24.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

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

2026-07-17 20:30Z3 MO AGO

Last updated

2026-07-20 13:48Z3 MO AGO

Reserved

2026-06-10

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 8.9)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N

Weaknesses

• CWE-918Server-Side Request Forgery (SSRF)Base

Data version

5.2

Document digest

f7412204113f3fff03eaa20af90d9ad43fb53acebf6ef75cf2082edeb54185e0

• github.comhttps://github.com/premailer/css_parser/security/advisories/GHSA-9pmc-p236-855hx_refsource_CONFIRM
• github.comhttps://github.com/premailer/css_parser/commit/7d2ddf0189cd54b54f378f59daefa10cb036e476x_refsource_MISC
• github.comhttps://github.com/premailer/css_parser/commit/e0a151458b2a801ae265ba420862ef8b1127b3aex_refsource_MISC
• github.comhttps://github.com/premailer/css_parser/releases/tag/v3.0.0x_refsource_MISC