CVE-2026-34033 Apache Answer: HTML Content Injection in Email
Authenticated users can inject arbitrary HTML into notification emails sent to other users, potentially leading to script execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-34033?
CVE-2026-34033 is a medium-severity cross-site scripting vulnerability in Apache Answer, published on 9 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in Apache Answer.
This issue affects Apache Answer: through 2.0.0.
User-supplied content was included in notification emails without proper escaping, allowing authenticated users to inject arbitrary HTML into emails sent to other users. Users are recommended to upgrade to version 2.0.1, which fixes the issue.
Which versions are affected by CVE-2026-34033?
3 open source packages ship an affected version, including github.com/apache/incubator-answer and github.com/apache/answer. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/apache/incubator-answer Go | All versions | 1.7.2-0.20260509080709-d1a4092c61cc |
github.com/apache/incubator-answer Go | All versions | 1.7.2-0.20260509080709-d1a4092c61cc |
github.com/apache/answer Go | All versions | 1.7.2-0.20260509080709-d1a4092c61cc |
Products include Apache Answer.
How do I fix CVE-2026-34033?
Upgrade github.com/apache/incubator-answer to 1.7.2-0.20260509080709-d1a4092c61cc or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-34033 being exploited?
There is no known exploitation of CVE-2026-34033 in the wild and no public exploit code.
Other vulnerabilities in Apache Answer
- CVE-2026-60053 Apache Answer: Residual Administrative API Key Access After Role or Account Revocation
- CVE-2024-22393 Apache Answer: Pixel Flood Attack by uploading the large pixel file
- CVE-2026-48834 Apache Answer: Denial of service via crafted Accept-Language header parsing
- CVE-2026-48911 Apache Answer: Unauthenticated OAuth Email-Binding Account Takeover via Existing User Confirmation Flow
- CVE-2026-60023 Apache Answer: Unauthorized disclosure of deleted or pending answer content
Sources
Also known as GHSA-6qwm-5fm9-cvjx, GO-2026-6151.