How severe is CVE-2026-34206?

CVE-2026-34206 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-34206 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34206?

CVE-2026-34206 affects Libops Captcha Protect. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34206?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-34206 have an EU (EUVD) identifier?

Yes. CVE-2026-34206 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17602.

When was CVE-2026-34206 published?

CVE-2026-34206 was published on 2026-03-31 and last updated on 2026-06-17.

CVE-2026-34206

CVE-2026-34206 is a medium-severity vulnerability in Libops Captcha Protect with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17602
Weakness: CWE-79
Affected product: Libops Captcha Protect
Published: 2026-03-31
Last modified: 2026-06-17

Description

Captcha Protect is a Traefik middleware to add an anti-bot challenge to individual IPs in a subnet when traffic spikes are detected from that subnet. Prior to version 1.12.2, a reflected cross-site scripting (XSS) vulnerability exists in github.com/libops/captcha-protect. The challenge page accepted a client-supplied destination value and rendered it into HTML using Go's text/template. Because text/template does not perform contextual HTML escaping, an attacker could supply a crafted destination value that breaks out of the hidden input attribute and injects arbitrary script into the challenge page. This issue has been patched in version 1.12.2.

Frequently asked questions

What is CVE-2026-34206?: Captcha Protect is a Traefik middleware to add an anti-bot challenge to individual IPs in a subnet when traffic spikes are detected from that subnet. Prior to version 1.12.2, a reflected cross-site scripting (XSS) vulnerability exists in github.com/libops/captcha-protect. The challenge page accepted a client-supplied destination value and rendered it into HTML using Go's text/template. Because text/template does not perform contextual HTML escaping, an attacker could supply a crafted destination value that breaks out of the hidden input attribute and injects arbitrary script into the challenge page. This issue has been patched in version 1.12.2.
How severe is CVE-2026-34206?: CVE-2026-34206 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-34206 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34206?: CVE-2026-34206 affects Libops Captcha Protect. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34206?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-34206 have an EU (EUVD) identifier?: Yes. CVE-2026-34206 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17602.
When was CVE-2026-34206 published?: CVE-2026-34206 was published on 2026-03-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:libops:captcha_protect:*:*:*:*:*:traefik:*:*

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