CVE-2026-71497Network attack vectorHinoki check available

Cross-site scripting via trimmed control-character tag names

Published Aug 6, 2026 · Updated Aug 6, 2026

Cross-site scripting in jsoup 1.14.3 through 1.22.2 allows remote attackers to inject active markup through malformed HTML sanitization. The HTML tokenizer uses trim-based tag-name normalization, so a trailing control character can make a malformed tag inherit another element's raw-text parsing behavior and serialize inert text as markup. Exploitation requires a custom Safelist that permits raw-text elements and user interaction with the serialized output; built-in Safelists are unaffected.

CVSS severity4.7
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Cross-site scripting in jsoup 1.14.3 through 1.22.2 allows remote attackers to inject active markup through malformed HTML sanitization. The HTML tokenizer uses trim-based tag-name normalization, so a trailing control character can make a malformed tag inherit another element's raw-text parsing behavior and serialize inert text as markup. Exploitation requires a custom Safelist that permits raw-text elements and user interaction with the serialized output; built-in Safelists are unaffected.

The record

CVE
CVE-2026-71497
Published
Aug 6, 2026
Updated
Aug 6, 2026
Vendor
Jonathan Hedley
Product
jsoup
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.14.3, < 1.23.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Jonathan Hedley · jsoupversion=>= 1.14.3, < 1.23.1

Published CVSS scores

4.7GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo