🛡️ CVE-2026-71497 — jsoup

🟡 CVSS 4.7 — Medium ✅ No Known Exploit CWE-79 NVD
4.7
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

jsoup: Cleaner may expose markup with custom raw-text elements

When a custom Safelist permits certain raw-text elements, jsoup may incorrectly sanitize malformed HTML containing a tag name that ends in a control character. The tag may acquire the parsing behavior of a different element, causing content that should remain text to be emitted as active markup after serialization and potentially allowing XSS.

jsoup’s built-in Safelists are unaffected.

Patches

Upgrade to jsoup 1.23.1.

Workarounds

Until upgrading, do not permit raw-text elements in custom Safelists used to clean untrusted HTML.

Additional security considerations

This fix addresses malformed tag-name handling only.

Permitting raw-text elements in a custom Safelist does not make their contents inherently safe. For example, applications that permit style must apply appropriate CSS safeguards separately, because jsoup does not parse or sanitize CSS.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality low, integrity low, availability none.

Weakness class

CVE-2026-71497 is classified as CWE-79: Cross-site Scripting (XSS). User-supplied data is written into a page without escaping, so attacker script runs in the browser of anyone who views it.

Affected software

CVE-2026-71497 is recorded against 2 packages.

  • org.jsoup:jsoup (from 1.14.3 up to 1.23.1)
  • unknown

Timeline and source

Published on 6 August 2026 and last revised on 7 August 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
github.com (Web)
github.com (Web)
github.com (Package)
github.com (Web)

Details

Severity Medium
CVSS Score 4.7
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE CWE-79
Public Exploit ✅ No
Source NVD
Published 2026-08-06
Updated 2026-08-12
Modified 2026-08-07
Fix URL N/A

Affected Packages

Software From version Fixed in
org.jsoup:jsoup 1.14.3 1.23.1
unknown — —

Similar Threats

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