Threats / Roundcube / CVE-2021-44026
CVE-2021-44026
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-08-04
Roundcube Webmail vulnerability
Roundcube Webmail contains a SQL injection vulnerability in search functionality that allows attackers to execute arbitrary database queries.
Verdict
Today item — known-exploited.
SQL injection via search parameters in Roundcube Webmail enables unauthenticated or authenticated attackers to manipulate database queries, potentially leading to unauthorized data access, modification, or deletion of email and user information.
CISA KEV Yes · 2023-06-224EPSS 0.42751 (verify live)5Exploit Weaponized · public PoC6CVSS 9.8 (CISA)3CISA SSVC Exploitation: active · Automatable: yes · Impact: total3
01
Is it exploitable?
— the evidence, ranked above the scoreExploit available
Fully weaponized — public exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
10 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-06-22).
Probability (EPSS)
EPSS 0.42751 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) · Affected: Roundcube, Roundcube Webmail. Confirm exact fixed builds in the vendor advisory.CVSS — CISA-assigned via the ADP container (CVE.org), version 3.1; the CNA left no metrics, so CISA's own score is used ahead of NVD.
Weakness (CWE)
Mapped to CWE-89 SQL Injection — weakness family: Injection.CWE assignment from the public NVD record (may be stale); the weakness class drives how the flaw is exploited.
CISA SSVC (triage disposition)
Exploitation: active · Automatable: yes · Technical Impact: totalCISA's own stakeholder-specific triage inputs, published in the CVE record (CISA Coordinator role). NOTE: this is CISA's three decision points; the final Act/Attend/Track decision also requires a Mission & Well-being input not published here, so no overall decision is asserted.
Currency of the record
CISA added this to its KEV catalog 580 days after the CVE record was published.KEV lag = CISA-KEV dateAdded − CVE.org datePublished; a floor on how long the known-exploited flaw sat in the public record before the federal catalog listed it. Severity/weakness here is CNA- or CISA-assigned (current at disclosure), independent of NVD's analysis backlog.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft malicious SQL syntax in search or search_params fields to break out of the intended query context.
Business
Attacker gains unauthorized access to sensitive email data, user credentials, and personal information stored in the Roundcube database.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I execute database queries to enumerate schema, extract user accounts, and retrieve authentication tokens or session data.
Business
Compromise of user accounts enables lateral movement, credential theft, and impersonation of legitimate webmail users.
3
Lateral reach — past segmentation narrative 3
Attacker
I modify or delete database records to alter email contents, user settings, or administrative configurations.
Business
Loss of data integrity, disruption of email services, and potential regulatory violations related to data protection and audit trails.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05