NVD / CVE Program· CNA GitHub_M

CVE-2023-48307: Nextcloud Mail app vulnerable to Server-Side Request Forgery

Noroxi assessment

Priority: Monitor (action score 39/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.86% (FIRST EPSS); higher than 58.7% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
No fixed version is recorded, but the references include a patch (commit or PR) link.
Severity is disputed: the assigning authority (CNA) scores it 3.5, NVD 9.8.

Low priority for now. See the fix and affected versions sections below.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Nextcloud Mail is the mail app for Nextcloud, a self-hosted productivity platform. Starting in version 1.13.0 and prior to version 2.2.8 and 3.3.0, an attacker can use an unprotected endpoint in the Mail app to perform a SSRF attack. Nextcloud Mail app versions 2.2.8 and 3.3.0 contain a patch for this issue. As a workaround, disable the mail app.

CriticalCVSS 9.8 · v3.1—No exploit No fix recorded

Published: Nov 21, 2023
Updated: Jun 17, 2026
EPSS: 0.8% · 58th percentile
CWE: CWE-918

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 39 / 40 · 9.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.8%

CNA vs NVD score

NVD: 9.8
CNA · GitHub_M: 3.5; 6.3 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
nextcloud	mail	cpe:2.3:a:nextcloud:mail

Affected versions

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

nextcloud mail1.13.0 and later · before 2.2.8
nextcloud mail3.0.0 and later · before 3.3.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

nextcloud security-advisories
- >= 1.13.0, < 2.2.8, >= 3.1.0, < 3.3.0affected

Same product

nextcloud: all records

Other highest-scoring records for the same primary product.

CVE-2022-31132Unauthenticated SSRF in 3rd party module "cerdic/csstidy"
39Monitor
CVE-2024-52508Nextcloud Mail auto configurator can be tricked into sending account information to wrong servers
32Monitor
CVE-2020-8156A missing verification of the TLS host in Nextcloud Mail 1.1.3 allowed a man in the middle attack.
28Monitor

Published before and after this one in the same product

← EarlierCVE-2023-33184May 27, 2023 · Blind SSRF in the Nextcloud Mail app on avatar endpoint
21Monitor
← EarlierCVE-2023-45660Oct 16, 2023 · Require strict cookies for image proxy requests in Nextcloud Mail
17Monitor
Later →CVE-2024-52509Nov 15, 2024 · Nextcloud Mail app does not respect download permissions in shares
22Monitor

Remediation

Which version to upgrade to

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

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

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.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

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

nextcloud/mailPR 8709

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.

CVE-2022-31132474 days apartUnauthenticated SSRF in 3rd party module "cerdic/csstidy"
39Monitor
CVE-2023-33184178 days apartBlind SSRF in the Nextcloud Mail app on avatar endpoint
21Monitor
CVE-2023-4566036 days apartRequire strict cookies for image proxy requests in Nextcloud Mail
17Monitor
CVE-2023-23943288 days apartBlind SSRF via server URL input in the Nextcloud Mail app
17Monitor

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