How severe is CVE-2026-27645?

CVE-2026-27645 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-2026-27645 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27645?

CVE-2026-27645 affects Webtechnologies Changedetection. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27645?

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

Does CVE-2026-27645 have an EU (EUVD) identifier?

Yes. CVE-2026-27645 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8621.

When was CVE-2026-27645 published?

CVE-2026-27645 was published on 2026-02-25 and last updated on 2026-06-17.

CVE-2026-27645

CVE-2026-27645 is a medium-severity vulnerability in Webtechnologies Changedetection 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% (36th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-8621
Weakness: CWE-79
Affected product: Webtechnologies Changedetection
Published: 2026-02-25
Last modified: 2026-06-17

Description

changedetection.io is a free open source web page change detection tool. In versions prior to 0.54.1, the RSS single-watch endpoint reflects the UUID path parameter directly in the HTTP response body without HTML escaping. Since Flask returns text/html by default for plain string responses, the browser parses and executes injected JavaScript. Version 0.54.1 contains a fix for the issue.

Frequently asked questions

What is CVE-2026-27645?: changedetection.io is a free open source web page change detection tool. In versions prior to 0.54.1, the RSS single-watch endpoint reflects the UUID path parameter directly in the HTTP response body without HTML escaping. Since Flask returns text/html by default for plain string responses, the browser parses and executes injected JavaScript. Version 0.54.1 contains a fix for the issue.
How severe is CVE-2026-27645?: CVE-2026-27645 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-2026-27645 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27645?: CVE-2026-27645 affects Webtechnologies Changedetection. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27645?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-27645 have an EU (EUVD) identifier?: Yes. CVE-2026-27645 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8621.
When was CVE-2026-27645 published?: CVE-2026-27645 was published on 2026-02-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:webtechnologies:changedetection:*:*:*:*:*:*:*:*

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