Authenticated HTML injection via unescaped template data
Published Jun 9, 2026 · Updated Jun 9, 2026
Basic XSS in Apache Answer 2.0.0 and earlier allows remote authenticated users to inject arbitrary HTML into notification emails. EmailService passes attacker-controlled site names, display names, question titles, tags, and summaries into translated HTML bodies without escaping them. A recipient must open a generated email, allowing attacker-controlled markup and links to affect only the rendered message.
Summary
What happened
Basic XSS in Apache Answer 2.0.0 and earlier allows remote authenticated users to inject arbitrary HTML into notification emails. EmailService passes attacker-controlled site names, display names, question titles, tags, and summaries into translated HTML bodies without escaping them. A recipient must open a generated email, allowing attacker-controlled markup and links to affect only the rendered message.
The record
- CVE
- CVE-2026-34033
- Published
- Jun 9, 2026
- Updated
- Jun 9, 2026
- Vendor
- The Apache Software Foundation
- Product
- Apache Answer
- Classifications
- CWE-79, CWE-80, T1566.002
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 9, 2026CVE publishedPublication date reported by the CVE source.
- Jun 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=2.0.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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