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CVE-2020-35730· NVD / CVE Program· CNA mitre

An XSS issue was discovered in Roundcube Webmail before 1.2.13, 1.3.x before 1.3.16, and 1.4.x before 1.4.10.

An XSS issue was discovered in Roundcube Webmail before 1.2.13, 1.3.x before 1.3.16, and 1.4.x before 1.4.10. The attacker can send a plain text e-mail message, with JavaScript in a link reference element that is mishandled by linkref_addindex in rcube_string_replacer.php.

MediumCVSS 6.1 · v3.1KEVWeaponized Fix available
Published
Dec 28, 2020
Updated
Jun 16, 2026
EPSS
32.7% · 98th percentile
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Report tools

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Action score

64

This week

Don’t wait for the next maintenance window.

CVSS
24 / 40 · 6.1 / 10
CISA KEV
30 / 30 · Listed
EPSS
10 / 30 · 32.7%

CISA SSVC decision

Exploitation
active
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Jun 22, 2023. That signals real attacks, not theory.

Remediation deadline for government agencies: Jul 13, 2023.

Affected systems

VendorProduct
roundcubewebmail
fedoraprojectfedora
debiandebian linux

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Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • roundcube webmailbefore 1.2.13
  • roundcube webmail1.3.0 and later · before 1.3.16
  • roundcube webmail1.4 and later · before 1.4.10

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:10roundcubebefore 1.3.16+dfsg.1-1~deb10u11.3.16+dfsg.1-1~deb10u1
Debian:12roundcubebefore 1.4.10+dfsg.1-11.4.10+dfsg.1-1
Debian:9roundcubebefore 1.2.3+dfsg.1-4+deb9u81.2.3+dfsg.1-4+deb9u8
openSUSE:Leap 15.2roundcubemailbefore 1.3.16-lp152.4.6.11.3.16-lp152.4.6.1
openSUSE:Tumbleweedroundcubemailbefore 1.4.11-1.31.4.11-1.3
SUSE:Package Hub 15 SP1roundcubemailbefore 1.3.16-bp151.4.6.11.3.16-bp151.4.6.1
SUSE:Package Hub 15 SP2roundcubemailbefore 1.3.16-bp152.4.6.11.3.16-bp152.4.6.1
SUSE:Package Hub 15 SP2roundcubemailbefore 1.3.16-bp152.4.14.11.3.16-bp152.4.14.1
SUSE:Package Hub 15 SP2roundcubemailbefore 1.3.16-bp152.4.10.11.3.16-bp152.4.10.1
SUSE:Package Hub 15 SP2roundcubemailbefore 1.3.16-bp152.4.18.11.3.16-bp152.4.18.1
SUSE:Package Hub 15 SP3roundcubemailbefore 1.5.3-bp154.2.3.11.5.3-bp154.2.3.1
SUSE:Package Hub 15 SP3roundcubemailbefore 1.5.3-bp154.2.3.11.5.3-bp154.2.3.1

Same product

roundcube: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-49113Roundcube Webmail before 1.5.10 and 1.6.x before 1.6.11 allows remote code execution by authenticated users because the _from parameter in aKEV
    95Now
  • CVE-2020-12641rcube_image.php in Roundcube Webmail before 1.4.4 allows attackers to execute arbitrary code via shell metacharacters in a configuration setKEV
    94Now
  • CVE-2024-42009A Cross-Site Scripting vulnerability in Roundcube through 1.5.7 and 1.6.x through 1.6.7 allows a remote attacker to steal and send emails ofKEV
    92Now
  • CVE-2021-44026Roundcube before 1.3.17 and 1.4.x before 1.4.12 is prone to a potential SQL injection via search or search_params.KEV
    90Now
  • CVE-2020-13965An issue was discovered in Roundcube Webmail before 1.3.12 and 1.4.x before 1.4.5.KEV
    77This week
  • CVE-2024-37383Roundcube Webmail before 1.5.7 and 1.6.x before 1.6.7 allows XSS via SVG animate attributes.KEV
    76This week

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Debian:roundcube1.4.10+dfsg.1-1 · Debian:12Package registry (OSV)
openSUSE:roundcubemail1.3.16-lp152.4.6.1 · openSUSE:Leap 15.2Package registry (OSV)
SUSE:roundcubemail1.3.16-bp152.4.6.1 · SUSE:Package Hub 15 SP2Package registry (OSV)
SUSE:roundcubemail1.5.3-bp154.2.3.1 · SUSE:Package Hub 15 SP3Package registry (OSV)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02025-04-20

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. CISA KEV+905 d
  3. First PoC+1573 d
  4. TodaySep 29, 2026+2101 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

nvd-primary

Root cause

User content is inserted into the page as HTML. The browser interprets the content as code rather than data.

The bug in code

The whole CWE-79 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
commentEl.innerHTML = comment.body;

Fixed

ts
commentEl.textContent = comment.body;

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records