CVE-2017-8812
MediaWiki before 1.27.4, 1.28.x before 1.28.3, and 1.29.x before 1.29.2 allows remote attackers...
MediaWiki before 1.27.4, 1.28.x before 1.28.3, and 1.29.x before 1.29.2 allows remote attackers to inject > (greater than) characters via the id attribute of a headline.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
MediaWiki before 1.27.4, 1.28.x before 1.28.3, and 1.29.x before 1.29.2 allows remote attackers to inject > (greater than) characters via the id attribute of a headline.
- Record
CVE-2017-8812- CVSS 3.0
- 5.3 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:P/A:N - Updated
- 2026-11-02
CVE List No score
MediaWiki before 1.27.4, 1.28.x before 1.28.3, and 1.29.x before 1.29.2 allows remote attackers to inject > (greater than) characters via the id attribute of a headline.
- Record
CVE-2017-8812- Updated
- 2026-11-02
EUVDEUVD-2017-17755 No score
MediaWiki before 1.27.4, 1.28.x before 1.28.3, and 1.29.x before 1.29.2 allows remote attackers to inject > (greater than) characters via the id attribute of a headline.
- Record
EUVD-2017-17755- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-7c6g-3j56-238r
MediaWiki before 1.27.4, 1.28.x before 1.28.3, and 1.29.x before 1.29.2 allows remote attackers...
MediaWiki before 1.27.4, 1.28.x before 1.28.3, and 1.29.x before 1.29.2 allows remote attackers to inject > (greater than) characters via the id attribute of a headline.
- Record
GHSA-7c6g-3j56-238r- CVSS 3.0
- 5.3 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Updated
- 2026-11-02
OSV
MediaWiki before 1.27.4, 1.28.x before 1.28.3, and 1.29.x before 1.29.2 allows remote attackers to inject > (greater than) characters via the id attribute of a headline.
- Record
CVE-2017-8812- CVSS 3.0
- 5.3 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Updated
- 2026-11-02
OSVDEBIAN-CVE-2017-8812
MediaWiki before 1.27.4, 1.28.x before 1.28.3, and 1.29.x before 1.29.2 allows remote attackers to inject > (greater than) characters via the id attribute of a headline.
- Record
DEBIAN-CVE-2017-8812- CVSS 3.0
- 5.3 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Updated
- 2026-11-02
OSVMGASA-2017-0429 No score
Updated mediawiki packages fix security vulnerabilities
XSS when $wgShowExceptionDetails = false and browser sends non-standard url escaping (CVE-2017-8808).
Reflected File Download from api.php (CVE-2017-8809).
On private wikis, login form shouldn't distinguish between login failure due to bad username and bad password (CVE-2017-8810).
It's possible to mangle HTML via raw message parameter expansion (CVE-2017-8811).
The id attribute on headlines allow raw > (CVE-2017-8812).
Language converter can be tricked into replacing text inside tags by adding a lot of junk after the rule definition (CVE-2017-8814).
Language converter: unsafe attribute injection via glossary rules (CVE-2017-8815).
composer.json has require-dev versions of PHPUnit with known security issues (CVE-2017-9841).
Note that MediaWiki 1.23.x on Mageia 5 is no longer supported. Those using the mediawiki package on Mageia 5 should upgrade to Mageia 6.
- Record
MGASA-2017-0429- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
mediawikiDebian:12 |
before 1:1.27.4-1 | 1:1.27.4-1 |
mediawikiDebian:13 |
before 1:1.27.4-1 | 1:1.27.4-1 |
mediawikiDebian:14 |
before 1:1.27.4-1 | 1:1.27.4-1 |
mediawikiDebian:9 From an advisory covering 7 CVEs |
before 1:1.27.4-1~deb9u1, plus listed versions 1:1.27.3-11:1.27.4-1~bpo8+1 |
1:1.27.4-1~deb9u1 |
mediawikiMageia:6 From an advisory covering 8 CVEs |
before 1.27.4-1.mga6 | 1.27.4-1.mga6 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2017-8812 is a medium vulnerability (CVSS 5.3) in Mediawiki, published November 15, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.57%, the 75th percentile. Fixed in mediawiki 1:1.27.4-1.
References
securitytracker.com/id/1039812
lists.wikimedia.org/pipermail/mediawiki-announce/2017-November/000216.html
debian.org/security/2017/dsa-4036
nvd.nist.gov/vuln/detail/CVE-2017-8812
github.com/advisories/GHSA-7c6g-3j56-238r
security-tracker.debian.org/tracker/CVE-2017-8812
advisories.mageia.org/MGASA-2017-0429.html
bugs.mageia.org/show_bug.cgi?id=22038