How severe is CVE-2021-29267?

CVE-2021-29267 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-2021-29267 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-29267?

CVE-2021-29267 affects Sherlockim. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-29267?

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

When was CVE-2021-29267 published?

CVE-2021-29267 was published on 2021-03-29 and last updated on 2026-06-17.

CVE-2021-29267

CVE-2021-29267 is a medium-severity vulnerability in Sherlockim 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)
CVSS v2: 4.3
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Sherlockim
Published: 2021-03-29
Last modified: 2026-06-17

Description

Sherlock SherlockIM through 2021-03-29 allows Cross Site Scripting (XSS) by leveraging the api/Files/Attachment URI to attack help-desk staff via the chatbot feature.

Frequently asked questions

What is CVE-2021-29267?: Sherlock SherlockIM through 2021-03-29 allows Cross Site Scripting (XSS) by leveraging the api/Files/Attachment URI to attack help-desk staff via the chatbot feature.
How severe is CVE-2021-29267?: CVE-2021-29267 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-2021-29267 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-29267?: CVE-2021-29267 affects Sherlockim. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-29267?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-29267 published?: CVE-2021-29267 was published on 2021-03-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:sherlockim:sherlockim:*:*:*:*:*:*:*:*

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