CVE-2021-3734
Improper Restriction of Rendered UI Layers or Frames in yourls/yourls
yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames
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
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Improper Restriction of Rendered UI Layers or Frames in yourls/yourls
yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames
- Record
CVE-2021-3734- CVSS 3.0
- 6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-1021
- Updated
- 2026-11-02
EUVDEUVD-2021-1859
yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames
- Record
EUVD-2021-1859- CVSS 3.0
- 6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-r6g8-jmj9-g945
Improper Restriction of Rendered UI Layers or Frames in yourls
yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames
- Record
GHSA-r6g8-jmj9-g945- CVSS 3.0
- 6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-352, CWE-1021
- Updated
- 2026-11-02
NVD
yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames
- Record
CVE-2021-3734- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 3.0
- 6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N - CVSS 2.0
- 6.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P - Weakness
- CWE-1021, CWE-352
- Updated
- 2026-11-02
OSV
yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames
- Record
CVE-2021-3734- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVGHSA-r6g8-jmj9-g945
Improper Restriction of Rendered UI Layers or Frames in yourls
yourls is vulnerable to Improper Restriction of Rendered UI Layers or Frames
- Record
GHSA-r6g8-jmj9-g945- CVSS 3.0
- 6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-1021, CWE-352
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
yourls/yourlsPackagist |
through 1.8.1 | None known |
yourls/yourlsPackagist |
through 1.8.1, plus listed versions 1.7.11.7.21.7.31.7.41.7.51.7.61.7.91.8 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| 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-2021-3734 is a medium vulnerability (CVSS 6.5) in Yourls, published August 26, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.40%, the 34th percentile. No source names a fixed version.