PatchTheCVECVE-2021-4302: A vulnerability was found in slackero phpwcms up to 1.9.26
CVE-2021-4302 is a low-severity flaw (CVSS 3.5) affecting phpwcms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
A vulnerability was found in slackero phpwcms up to 1.9.26. It has been classified as problematic. This affects an unknown part of the component SVG File Handler. The manipulation leads to cross site scripting. It is possible to initiate the attack remotely. Upgrading to version 1.9.27 is able to address this issue. The patch is named b39db9c7ad3800f319195ff0e26a0981395b1c54. It is recommended to upgrade the affected component. The associated ide
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 3.5 (Low) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | Required |
| EPSS exploit chance | 0.6% (top 54%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| Published | 2023-01-04 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-4302?
phpwcms: upgrade to 1.9.27. Exact commands for each OS are on this page.
Is CVE-2021-4302 being exploited?
CVE-2021-4302 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-4302 affect?
CVE-2021-4302 affects phpwcms. Severity is low (CVSS 3.5). A vulnerability was found in slackero phpwcms up to 1.9.26. It has been classified as problematic. This affects an unknown part of the component SVG File Handler. The manipulation leads to cross site scripting. It is possible to initiate th
How urgent is CVE-2021-4302?
Priority 24/100. No elevated risk signals yet.
Related CVEs
- CVE-2025-5499 HIGH 7.3 UPGRADE A vulnerability classified as critical has been found in slackero phpwcms up to 1.9.45/1.10.8
- CVE-2025-5498 MEDIUM 5.5 UPGRADE A vulnerability was found in slackero phpwcms up to 1.9.45/1.10.8
- CVE-2025-5497 MEDIUM 6.3 UPGRADE A vulnerability was detected in slackero phpwcms up to 1.9.45/1.10.8
- CVE-2021-4301 MEDIUM 6.3 UPGRADE A vulnerability was found in slackero phpwcms up to 1.9.26 and classified as critical
- CVE-2021-47783 MEDIUM 5.4 DOWNGRADE Phpwcms 1.9.30 contains a file upload vulnerability that allows authenticated attackers to upload malicious SV