How severe is CVE-2021-26903?

CVE-2021-26903 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-2021-26903 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26903?

CVE-2021-26903 affects Isida Retriever. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-26903?

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

When was CVE-2021-26903 published?

CVE-2021-26903 was published on 2021-02-26 and last updated on 2026-06-17.

CVE-2021-26903

CVE-2021-26903 is a medium-severity vulnerability in Isida Retriever 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% (58th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Isida Retriever
Published: 2021-02-26
Last modified: 2026-06-17

Description

LMA ISIDA Retriever 5.2 is vulnerable to XSS via query['text'].

Frequently asked questions

What is CVE-2021-26903?: LMA ISIDA Retriever 5.2 is vulnerable to XSS via query['text'].
How severe is CVE-2021-26903?: CVE-2021-26903 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-2021-26903 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26903?: CVE-2021-26903 affects Isida Retriever. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-26903?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-26903 published?: CVE-2021-26903 was published on 2021-02-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:isida:retriever:5.2:*:*:*:*:*:*:*

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CVE-2021-26904 — Critical (CVSS 9.8): LMA ISIDA Retriever 5.2 allows SQL Injection.

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