CVE-2021-26539

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

1.95% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 78.5% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

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

Red Hat severity

Moderate. 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

2021-02-08 16:16Z5 YR AGO

Last updated

2024-08-03 20:26Z2 YR AGO

Reserved

2021-02-01

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-20Improper Input ValidationClass

Data version

5.1

Document digest

5fe2baa4be476db72d20b70c1ab8c9ed2f861f205f3244e247235f6b8c5e6dfd

• github.comhttps://github.com/apostrophecms/sanitize-html/blob/main/CHANGELOG.md#231-2021-01-22x_refsource_MISC
• github.comhttps://github.com/apostrophecms/sanitize-html/pull/458x_refsource_MISC
• advisory.checkmarx.nethttps://advisory.checkmarx.net/advisory/CX-2021-4308x_refsource_MISC