CVE-2021-4271: A vulnerability was found in panicsteve w2wiki

Routine

LOW 3.5MITIGATE

CVE-2021-4271 is a low-severity flaw (CVSS 3.5) affecting w2wiki. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability was found in panicsteve w2wiki. It has been rated as problematic. Affected by this issue is the function toHTML of the file index.php of the component Markdown Handler. The manipulation leads to cross site scripting. The attack may be launched remotely. The name of the patch is 8f1d0470b4ddb1c7699e3308e765c11ed29542b6. It is recommended to apply a patch to fix this issue. The identifier of this vulnerability is VDB-216476.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	3.5 (Low)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-707, CWE-79
Published	2022-12-21
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: w2wiki project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-12-21 19:15 UTCPublished CVE record published
2026-06-17 04:19 UTCUpdated Record last modified

w2wiki project w2wiki MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy w2wiki || rpm -q w2wiki || w2wiki --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
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-2021-4271?

w2wiki: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-4271 being exploited?

CVE-2021-4271 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-2021-4271 affect?

CVE-2021-4271 affects w2wiki. Severity is low (CVSS 3.5). A vulnerability was found in panicsteve w2wiki. It has been rated as problematic. Affected by this issue is the function toHTML of the file index.php of the component Markdown Handler. The manipulation leads to cross site scripting. The att

How urgent is CVE-2021-4271?

Priority 20/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities

References

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