CVE-2018-6520
SimpleSAMLphp Open redirection protection bypass
CVE-2018-6520 is a medium vulnerability (CVSS 6.1) in Simplesamlphp, published February 2, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.85%, the 58th percentile. Fixed in simplesamlphp/simplesamlphp 1.15.2.
SimpleSAMLphp before 1.15.2 allows remote attackers to bypass an open redirect protection mechanism via crafted authority data in a URL.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
SimpleSAMLphp before 1.15.2 allows remote attackers to bypass an open redirect protection mechanism via crafted authority data in a URL.
- Record
CVE-2018-6520- CVSS 3.0
- 6.1 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 5.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:N - Weakness
- CWE-601
- Updated
- 2026-11-02
CVE List No score
SimpleSAMLphp before 1.15.2 allows remote attackers to bypass an open redirect protection mechanism via crafted authority data in a URL.
- Record
CVE-2018-6520- Updated
- 2026-11-02
EUVDEUVD-2022-2034 No score
SimpleSAMLphp before 1.15.2 allows remote attackers to bypass an open redirect protection mechanism via crafted authority data in a URL.
- Record
EUVD-2022-2034- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-2qfc-48v5-4w5h
SimpleSAMLphp Open redirection protection bypass
SimpleSAMLphp before 1.15.2 allows remote attackers to bypass an open redirect protection mechanism via crafted authority data in a URL.
- Record
GHSA-2qfc-48v5-4w5h- CVSS 3.0
- 6.1 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-601
- Updated
- 2026-11-02
OSV
SimpleSAMLphp before 1.15.2 allows remote attackers to bypass an open redirect protection mechanism via crafted authority data in a URL.
- Record
CVE-2018-6520- CVSS 3.0
- 6.1 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSVDEBIAN-CVE-2018-6520
SimpleSAMLphp before 1.15.2 allows remote attackers to bypass an open redirect protection mechanism via crafted authority data in a URL.
- Record
DEBIAN-CVE-2018-6520- CVSS 3.0
- 6.1 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSVGHSA-2qfc-48v5-4w5h
SimpleSAMLphp Open redirection protection bypass
SimpleSAMLphp before 1.15.2 allows remote attackers to bypass an open redirect protection mechanism via crafted authority data in a URL.
- Record
GHSA-2qfc-48v5-4w5h- CVSS 3.0
- 6.1 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-601
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2018-6520
SimpleSAMLphp before 1.15.2 allows remote attackers to bypass an open redirect protection mechanism via crafted authority data in a URL.
- Record
UBUNTU-CVE-2018-6520- CVSS 3.0
- 6.1 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
simplesamlphp/simplesamlphpPackagist |
before 1.15.2 | 1.15.2 |
simplesamlphpDebian:12 |
before 1.15.2-1 | 1.15.2-1 |
simplesamlphpDebian:14 |
before 1.15.2-1, plus listed versions 1.10.0-11.11.0-11.12.0-11.12.0~rc1-11.12.0~rc2-1 Show 36 moreShow less1.13.0-11.13.1-11.13.1-21.13.2-11.14.0-11.14.1-11.14.10-11.14.11-11.14.15-11.14.2-11.14.2-21.14.3-11.14.4-11.14.5-11.14.6-11.14.7-11.14.8-11.14.9-11.15.0-11.15.1-11.6.0-11.6.1-11.6.2-11.6.3-11.6.3-21.6.3-31.7.0-11.7.0-21.8.0-11.8.1-11.8.2-11.9.0-11.9.0~rc1-11.9.0~rc2-11.9.1-11.9.2-1 |
1.15.2-1 |
simplesamlphp/simplesamlphpPackagist |
before 1.15.2, plus listed versions v1.12.0v1.13.0v1.13.0-rc1v1.13.0-rc2v1.13.1 Show 25 moreShow lessv1.13.2v1.14.0v1.14.0-rc1v1.14.1v1.14.10v1.14.11v1.14.12v1.14.13v1.14.14v1.14.15v1.14.16v1.14.17v1.14.2v1.14.3v1.14.4v1.14.5v1.14.6v1.14.7v1.14.8v1.14.9v1.15.0v1.15.0-rc1v1.15.0-rc2v1.15.0-rc3v1.15.1 |
1.15.2 |
simplesamlphpUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 1.13.2-11.14.0-11.14.0-1ubuntu21.14.0-1ubuntu2+esm1 |
None known |
History
| When | Changed | Sources |
|---|---|---|
| 2026-11-03 | aliases | EUVD |
| 2026-11-02 | created | CVE List, GitHub Advisories, NVD, OSV |
References
simplesamlphp.org/security/201801-02
nvd.nist.gov/vuln/detail/CVE-2018-6520
github.com/simplesamlphp/simplesamlphp/issues/1473
security-tracker.debian.org/tracker/CVE-2018-6520
ubuntu.com/security/CVE-2018-6520
cve.org/CVERecord?id=CVE-2018-6520