CVE-2020-1959 json
Expression Language Injection in Apache Syncope
published 2020-05-04 6 y ago modified 2026-06-17 4 mo ago also GHSA-vjqw-r3ww-wj2w , EUVD-2021-1411
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 5.0%
- EPSS 5.0% chance of exploitation in 30 days, percentile 92%
- public exploits
- 0
- none known
Summary
A Server-Side Template Injection was identified in Apache Syncope prior to 2.1.6 enabling attackers to inject arbitrary Java EL expressions, leading to an unauthenticated Remote Code Execution (RCE) vulnerability. Apache Syncope uses Java Bean Validation (JSR 380) custom constraint validators. When building custom constraint violation error messages, they support different types of interpolation, including Java EL expressions. Therefore, if an attacker can inject arbitrary data in the error message template being passed, they will be able to run arbitrary Java code.
Patch / fix
- maven org.apache.syncope:syncope-core 2.1.6
- apache syncope 2.1.6
Exploit prediction
4.98% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | org.apache.syncope:syncope-core | <2.1.6 |
2.1.6 |
Affected products
- n/a Apache Syncope
Classification
- Weakness
-
- CWE-917 Improper Neutralization of Special Elements used in an Expression Language Statement
References
-
syncope.apache.org
/security
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2020-1959
advisory
Sources
- CVE List CVE-2020-1959
- GitHub Advisory GHSA-vjqw-r3ww-wj2w
- NVD CVE-2020-1959
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