Page generated: 11 Nov 2026, 04:22 UTC
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CVE-2023-43770

Roundcube before 1.4.14, 1.5.x before 1.5.4, and 1.6.x before 1.6.3 allows XSS via text/plain e-mail messages with crafted links because of program/lib/Roundcube/rcube_string_replacer.php behavior.

CVSS 6.1 (MEDIUM) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
8.2/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 6.1: +0.91
  • Fresh EPSS: 63.66%: +0.32

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 11 documents and public datasets.

Hype components

Headline sample (25%)
0/100
Press, 30 days (60%)
0/100
Grounded branding (15%)
0/100
HYPE TOTAL0/100

Sources and documents

The Hacker News
Press · 09 Oct 2025, 07:00 · From Phishing to Malware: AI Becomes Russia's New Cyber Weapon in War on Ukraine - The Hacker News
Dark Reading
Press · 10 Jun 2025, 07:00 · PoC Code Escalates Roundcube Vuln Threat - Dark Reading
The Hacker News
Press · 15 May 2025, 07:00 · Russia-Linked APT28 Exploited MDaemon Zero-Day to Hack Government Webmail Servers - The Hacker News
WeLiveSecurity
Press · 15 May 2025, 07:00 · Operation RoundPress targeting high-value webmail servers - WeLiveSecurity
ESET
Press · 15 May 2025, 07:00 · ESET Research uncovers Operation RoundPress: Russia-aligned Sednit targets entities linked to the Ukraine war to steal confidential data - ESET
See all 11 source documents
Field Effect
Press · 22 Oct 2024, 07:00 · Roundcube Webmail flaw actively exploited - Field Effect
Help Net Security
Press · 07 Aug 2024, 07:00 · Roundcube flaws allow easy email account compromise (CVE-2024-42009, CVE-2024-42008) - Help Net Security
The Record from Recorded Future News
Press · 17 Feb 2024, 08:00 · Russia-aligned hackers target European and Iranian embassies in new espionage campaign - The Record from Recorded Future News
Help Net Security
Press · 13 Feb 2024, 08:00 · Roundcube webmail XSS vulnerability exploited by attackers (CVE-2023-43770) - Help Net Security
The Hacker News
Press · 13 Feb 2024, 08:00 · Alert: CISA Warns of Active 'Roundcube' Email Attacks - Patch Now - The Hacker News
BleepingComputer
Press · 12 Feb 2024, 08:00 · CISA: Roundcube email server bug now exploited in attacks - BleepingComputer

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.0 · reality 8.2 (2026-11-02 15:13). The curve appears once the score changes.

Public exploit evidence

3

Public exploit entries / repo candidates

See 3 repos with metrics
RepositoryStarsForksLanguageUpdated
s3cb0y/CVE-2023-43770-POC3511Python02 Oct 2023, 17:41
knight0x07/CVE-2023-43770-PoC30—28 Sep 2023, 16:22
skyllpro/CVE-2021-44026-PoC00Python20 Apr 2025, 07:32
Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence
Exploitation recorded
Priority basis
Recorded exploitation; CVSS 6.1; EPSS 63.7%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
network access, no prior privileges, user interaction.
Observed activity
Exploitation recorded in CISA KEV.
Known scale
Not quantified.
Evidence confidence basis
Trusted exploitation confirmation

Score evaluated: 2026-11-05 13:58:59.307003+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
Published
22 Sep 2023, 00:00
Added to the CISA KEV catalog
12 Feb 2024, 00:00
First press mention
12 Feb 2024, 08:00
Latest press mention
09 Oct 2025, 07:00
Score calculated
05 Nov 2026, 13:58
PoCs on GitHub
3 repositories