CVE-2023-31145

MEDIUMNVD 4.34.3
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This medium-severity CVE scores 4.3 under NVD CVSS v3. EPSS exploit probability: 0.4% (32nd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
4.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 4.3Exploit: None knownExposed services: Not assessed

The CVE record names the fixed release — apply it.

Collabora Online is a collaborative online office suite based on LibreOffice technology. This vulnerability report describes a reflected XSS vulnerability with full CSP bypass in Nextcloud installations using the recommended bundle. The vulnerability can be exploited to perform a trivial account takeover attack. The vulnerability allows attackers to inject malicious code into web pages, which can be executed in the context of the victim's browser session. This means that an attacker can steal sensitive data, such as login credentials or personal information, or perform unauthorized actions on behalf of the victim, such as modifying or deleting data. In this specific case, the vulnerability allows for a trivial account takeover attack. An attacker can exploit the vulnerability to inject code into the victim's browser session, allowing the attacker to take over the victim's account without their knowledge or consent. This can lead to unauthorized access to sensitive information and data, as well as the ability to perform actions on behalf of the victim. Furthermore, the fact that the vulnerability bypasses the Content Security Policy (CSP) makes it more dangerous, as CSP is an important security mechanism used to prevent cross-site scripting attacks. By bypassing CSP, attackers can circumvent the security measures put in place by the web application and execute their malicious code. This issue has been patched in versions 22.05.13, 21.11.9, and 6.4.27. Users are advised to upgrade. There are no known workarounds for this vulnerability.

CVSS v3
4.3
EG Score
4.3MEDIUMmedium confidence
EG Risk
20
EG Risk 20/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity43% × 45%
Impact severity (EG Severity): CVSS 4.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: The CVE record names the fixed release. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
32nd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (4.3): severity, escalated by confirmed exploitation. This CVE's 4.3 is its impact severity (EG Severity), not escalated.

EG Severity
4.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-17). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

The CVE record names the fixed release. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 15, 2023

Last Modified

November 21, 2024

References (1)

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 34× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 92 of 196 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 8 repeat rows among the latest 100 are merged into the row they repeat. The 104 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-23 16:29 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  2. 2026-10-22 16:31 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  3. 2026-10-21 16:29 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  4. 2026-10-20 16:29 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  5. 2026-10-19 16:29 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  6. 2026-10-18 16:29 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  7. 2026-10-18 08:03 UTCEG score recompute
  8. 2026-10-17 16:29 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  9. 2026-10-16 16:35 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  10. 2026-10-15 16:29 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  11. 2026-10-14 16:29 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  12. 2026-10-14 05:54 UTCOSV refresh
  13. 2026-10-13 16:29 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  14. 2026-10-12 18:27 UTCEG score recompute
  15. 2026-10-12 16:30 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  16. 2026-10-11 21:53 UTCEG score recompute
  17. 2026-10-11 13:45 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  18. 2026-10-10 19:57 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  19. 2026-10-09 20:05 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  20. 2026-10-08 17:06 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  21. 2026-10-07 23:45 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  22. 2026-10-06 15:15 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  23. 2026-10-05 17:41 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  24. 2026-10-04 23:20 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  25. 2026-10-03 14:23 UTCEPSS rescoreEPSS 0.4% · 31st percentile
Show 67 more
  1. 2026-10-02 16:23 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  2. 2026-10-01 19:47 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  3. 2026-09-30 16:22 UTCEG score recompute
  4. 2026-09-30 15:01 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  5. 2026-09-29 15:16 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  6. 2026-09-28 13:49 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  7. 2026-09-27 13:42 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  8. 2026-09-26 00:22 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  9. 2026-09-24 14:01 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  10. 2026-09-23 13:45 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  11. 2026-09-23 11:53 UTCOSV refresh
  12. 2026-09-22 14:45 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  13. 2026-09-20 20:14 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  14. 2026-09-16 14:05 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  15. 2026-09-13 16:44 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  16. 2026-09-12 14:58 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  17. 2026-09-11 14:50 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  18. 2026-09-11 09:34 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  19. 2026-09-08 21:57 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  20. 2026-09-07 15:59 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  21. 2026-09-06 13:45 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  22. 2026-09-05 15:25 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  23. 2026-09-04 13:58 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  24. 2026-09-04 06:29 UTCOSV refresh
  25. 2026-09-04 05:04 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  26. 2026-09-02 14:09 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  27. 2026-09-01 13:51 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  28. 2026-08-30 19:15 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  29. 2026-08-30 01:19 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  30. 2026-08-28 21:38 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  31. 2026-08-27 14:23 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  32. 2026-08-26 14:43 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  33. 2026-08-25 13:46 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  34. 2026-08-24 14:14 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  35. 2026-08-23 00:17 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  36. 2026-08-21 23:46 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  37. 2026-08-20 22:53 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  38. 2026-08-19 17:02 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  39. 2026-08-18 13:46 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  40. 2026-08-17 17:29 UTCOSV refresh
  41. 2026-08-17 13:44 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  42. 2026-08-16 14:53 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  43. 2026-08-16 02:12 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  44. 2026-08-15 01:28 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  45. 2026-08-13 21:58 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  46. 2026-08-12 13:48 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  47. 2026-08-11 13:39 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  48. 2026-08-09 13:44 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  49. 2026-08-08 16:34 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  50. 2026-08-07 16:24 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  51. 2026-08-06 13:44 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  52. 2026-08-05 19:15 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  53. 2026-08-04 15:07 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  54. 2026-08-04 10:35 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  55. 2026-08-02 12:57 UTCOSV refresh
  56. 2026-08-02 02:24 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  57. 2026-08-01 04:13 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  58. 2026-07-30 16:26 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  59. 2026-07-30 01:28 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  60. 2026-07-28 15:34 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  61. 2026-07-27 14:10 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  62. 2026-07-26 14:52 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  63. 2026-07-25 14:16 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  64. 2026-07-24 14:15 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  65. 2026-07-23 14:16 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  66. 2026-07-23 02:22 UTCEG score recompute
  67. 2026-07-22 23:09 UTCEG score recompute

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Frequently asked(5)

What is CVE-2023-31145?
CVE-2023-31145 is a medium-severity vulnerability; its CVE record was published on May 15, 2023. Collabora Online is a collaborative online office suite based on LibreOffice technology. This vulnerability report describes a reflected XSS vulnerability with full CSP bypass in Nextcloud installations using the recommended bundle. The vulnerability can be exploited to perform a trivial account…
When was the CVE record for CVE-2023-31145 published?
The CVE record for CVE-2023-31145 was published on May 15, 2023. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of November 21, 2024; the record at its source may have been updated since.
Is CVE-2023-31145 actively exploited?
CVE-2023-31145 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (32nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2023-31145?
CVE-2023-31145 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2023-31145?
The CVE record for CVE-2023-31145 names the fix: "This issue has been patched in versions 22.05.13, 21.11.9, and 6.4.27."

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